Please use this identifier to cite or link to this item:
Title: Determining an optimal recovery time for construction rebar workers after working to exhaustion in a hot and humid environment
Authors: Chan, APC 
Yi, W
Wong, DP
Yam, CHM 
Chan, DWM 
Keywords: Heat stress
Physiological strain index (PSI)
Heat tolerance time
Field studies
Rebar workers
Rest time
Issue Date: Dec-2012
Publisher: Pergamon Press
Source: Building and environment, Dec. 2012, v. 58, p. 163-171 How to cite?
Journal: Building and environment 
Abstract: This paper is an extension to a paper previously published in the journal Building and Environment. Having determined an optimal recovery time in a controlled climatic environment, this paper aims to investigate the real impact on construction rebar workers by replicating the clinical experimentation to a series of field studies. Field studies were conducted during the summer time in Hong Kong. Nineteen rebar workers performed tasks of fixing and bending steel reinforcement bars on two building construction sites until voluntary exhaustion and were allowed to recover on site until their physiological conditions returned to the pre-work level or lower. Physiological Strain Index (PSI) was used as a yardstick to determine the rate of recovery. A total of 411 sets of meteorological and physiological data collected over fourteen working days between July and August of 2011 were collated to derive the optimal recovery time. It was found that on average a rebar worker could achieve 94% recovery in 40 min; 93% in 35 min; 92% in 30 min; 88% in 25 min; 84% in 20 min; 78% in 15 min; 68% in 10 min; and 58% in 5 min. Curve estimation results showed that recovery time is a significant variable to predict the rate of recovery (R² = 0.99, P < 0.05). Additional rest times should be introduced between works in extreme hot weather to enable workers to recover from heat stress. Frequency and duration of each rest time should be agreed among different stakeholders based on the cumulative recovery curve.
ISSN: 0360-1323
EISSN: 1873-684X
DOI: 10.1016/j.buildenv.2012.07.006
Rights: ©2012 Elsevier Ltd. All rights reserved.
NOTICE: this is the author’s version of a work that was accepted for publication in Building and Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Building and environment, v. 58 (Dec 2012), DOI: 10.1016/j.buildenv.2012.07.006
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Chan_Recovery_Time_Workers.pdfPre-published version847.82 kBAdobe PDFView/Open
View full-text via PolyU eLinks SFX Query
Show full item record
PIRA download icon_1.1View/Download Contents


Last Week
Last month
Citations as of Aug 13, 2018


Last Week
Last month
Citations as of Aug 14, 2018

Page view(s)

Last Week
Last month
Citations as of Aug 13, 2018


Citations as of Aug 13, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.